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/*
* Copyright 2021 The Emscripten Authors. All rights reserved.
* Emscripten is available under two separate licenses, the MIT license and the
* University of Illinois/NCSA Open Source License. Both these licenses can be
* found in the LICENSE file.
*/
#define _GNU_SOURCE // for sighandler_t
#include <stdbool.h>
#include <stddef.h>
#include <signal.h>
#include "emscripten_internal.h"
extern struct sigaction __sig_actions[_NSIG];
extern sigset_t __sig_pending;
bool __sig_is_blocked(int sig);
// Default handler actions ~auto-generated from https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/signal.h.html.
// Note that stop and continue actions are not supported and treated as ignored.
void action_abort(int sig) {
abort();
}
void action_terminate(int sig) {
// Prepare to forcibly shut down runtime even if it has async work in flight.
_emscripten_runtime_keepalive_clear();
// Intentionally exiting via a function that doesn't call atexit handlers.
_Exit(128 + sig);
}
static sighandler_t default_actions[_NSIG] = {
[SIGABRT] = action_abort,
[SIGALRM] = action_terminate,
[SIGBUS] = action_abort,
[SIGFPE] = action_abort,
[SIGHUP] = action_terminate,
[SIGILL] = action_abort,
[SIGINT] = action_terminate,
[SIGKILL] = action_terminate,
[SIGPIPE] = action_terminate,
[SIGQUIT] = action_abort,
[SIGSEGV] = action_abort,
[SIGTERM] = action_terminate,
[SIGUSR1] = action_terminate,
[SIGUSR2] = action_terminate,
[SIGPOLL] = action_terminate,
[SIGPROF] = action_terminate,
[SIGSYS] = action_abort,
[SIGTRAP] = action_abort,
[SIGVTALRM] = action_terminate,
[SIGXCPU] = action_abort,
[SIGXFSZ] = action_abort,
};
int raise(int sig) {
if (__sig_is_blocked(sig)) {
sigaddset(&__sig_pending, sig);
return 0;
}
if (__sig_actions[sig].sa_flags & SA_SIGINFO) {
siginfo_t t = {0};
__sig_actions[sig].sa_sigaction(sig, &t, NULL);
} else {
sighandler_t handler = __sig_actions[sig].sa_handler;
if (handler == SIG_DFL) {
handler = default_actions[sig];
if (handler) {
handler(sig);
}
} else if (handler != SIG_IGN) {
// Avoid a direct call to the handler, and instead call via JS so we can
// avoid strict signature checking.
// https://github.com/emscripten-core/posixtestsuite/issues/6
__call_sighandler(handler, sig);
}
}
return 0;
}
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